package com.adong.web;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Method;

/**
 * HttpServlet子类专门获取用户操作在调用利用反射去调用子类中的具体方法
 *
 * @author adong
 */
public class BaseServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8"); //解决请求乱码
        resp.setContentType("text/html;charset=utf-8"); //解决响应乱码
        //获取传过来的action是什么
        String action = req.getParameter("action");
        //利用反射
        try {
            Method declaredMethod = this.getClass().getDeclaredMethod(action, HttpServletRequest.class, HttpServletResponse.class);
            declaredMethod.setAccessible(true);
            declaredMethod.invoke(this, req, resp);
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e); //把异常抛给Filter过滤
        }

    }
}
